电源参考设计中心刘学超. June 2011

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1 _ 新型多串半桥谐振高效 LED 驱动解决方案及其应用电源参考设计中心刘学超 June 2011

LED General Illumination LED Lighting Residential < 25W or 3,000 lm Commercial 15W 75W or 1000 lm - 10000 lm Outdoor and Infrastructure 35W 250W 2500 lm - 30,000 lm MR16 Careabouts Devices

TPS92210EVM-613 Display Case Retail Display PFC, High Efficiency, Dimming, Early Payback, Color Quality, Safety, Maintenance, Ecofriendly UCC28810 UCC28811 TPS92020 UCC28810EVM-002

2 LED General Illumination LED Lighting Residential < 25W or 3,000 lm Commercial 15W 75W or 1000 lm lm Outdoor and Infrastructure 35W 250W 2500 lm - 30,000 lm MR16 Careabouts Devices Tools E14 E27/A19 PAR38 Low Cost, TRIAC Dimming, PFC, High Efficiency, Color Quality, Safety, Long Life TPS92010 TPS92210 TPS92001/2 TPS92010EVM-592 (110V) TPS92010EVM-631 (230V) TPS92210EVM-613 Display Case Retail Display PFC, High Efficiency, Dimming, Early Payback, Color Quality, Safety, Maintenance, Ecofriendly UCC28810 UCC28811 TPS92020 UCC28810EVM-002 UCC28810EVM-003 Architectural Street Light Area Light Flood Light PFC, High Efficiency, Early Payback, High Brightness, Safety, Maintenance, Eco-friendly UCC25710 UCC28810/1 TPS92020 new UCC28810EVM-003 UCC25710

3 High Watt (>100W) LED Lighting Driver Topology 1. AC/DC Power Stage 2. Constant Current Driver Stage UCC28061( Inter TM PFC) UCC28810/1(TM PFC) UCC25600 (LLC) TPS40211 TPS40200 TPS54160 TPS40211 TPS40200 TPS54160 ~15pcs LEDs in Series +

4 High Watt (>100W) LED Lighting Efficiency Budget 97% 96% 95% Conventional Topology Issues: High cost Low efficiency (<~88%) Low reliability <88% (Traditional solution)

5 1 st stage: TM Boost for PFC TI UCC28810EVM SIMPLEDrive Series Input, Multiple Parallel Equivalent LED Drive (SIMPLEDrive ) 2 nd stage: TM Buck for LED current 3 rd stage: Resonant Current Half Bridge 97% 98% 98% >93% (Three stages multi-string transformer solution) 5

6 Innovative two stages multi-string LLC topology for LED lighting UCC28811 HV Gate Driver UCC28810 UCC25600 new UCC28810 High efficiency ~93% No cost (no need CC DC/DC driver) High reliability PWM dimming compatible UCC25710

7 Why Transformer Can Balance Current Ip 1 Np T1 4 Ns Is1 Transformer current is in reverse proportion to turn ratio Ip/Np = Is/Ns; Is=Ns*Ip/Np Ip 2 3 When transformer primary is connected together, their primary current must be the same 1 Np T2 4 Ns Is2 When T1 is the same as T2 because of transformer operation principle their secondary current is the same 2 3 Is1=Ns*Ip/Np=Is2

8 Multi-Transformer Architecture (TI Patented)

9 UCC25710: LED driver Controller IC Industry first single chip LLC controller for driving multiple LED strings directly from PFC output Adjustable Fmin (3% accuracy), and Fmax 6% (accuracy) Closed Loop LED String Current Control PWM Dimming Input LLC and Series LED Switch Control for Dimming Programmable Dimming LLC ON/OFF Ramp for Elimination of Audible Noise Closed Loop Current Control at Low Dimming Duty- Cycles Programmable Soft Start Accurate VREF for Tight Output Regulation Over-voltage and Under-voltage and Input Over-current Protection with Auto-restart Response Second Over-current threshold with Latch-off Response +400-mA/-800mA Gate Drive Current Low Start-Up and Operating Currents 20 pin SO Lead (Pb)-Free Package General LED Lighting LED TV Backlighting

10 Supply Control LED Switch and Dimming Control UCC25710 Block Diagram LLC Control Current Regulation and VCO Slew Control Fault Control

11 UCC25710: DIMMING LLC ON/OFF TRANSITION & CURRENT CONTROL The DIM input controls the ILED-ON an ILED-ON` signals. DSR capacitor C2 and internal 44uA currents control the slew rate of V VCO during dimming off and on transitions. Turn-off: DSR is discharged to GND by 44uA Turn-on: DSR is charged to ICOMP by 44uA. Charge level is clamped to 1Vbe above ICOMP Control Clamp output, V VCO, tracks the lower of ICOMP and DSR LED RETURN R3 VCC R1 R2 C1 C2 5 CREF 15 CS ICOMP DSR 14 6 VREF V VREF LEDSW + ++ V VCO V CLREFCLO, 0.5V V CLREFCHI, 2.8V GM ICOMP 510uS Dimming Slew Control ICOMP 4K Current Amplifier GND H delay 2.4us + Control Clamp V VCO ILED-ON V VREF ILED-ON H L V VREF I DSRCH 44uA I DSRDC 44uA ICOMP is only driven by GM amp during LED-ON times. During LED-OFF times the ICOMP voltage is held by C1

12 UCC25710: START-UP & DIM WAVEFORMS 10ms RESET initiates Soft-Start (SS) LLC Soft-Start, VCO control is clamped to SS until SS > ICOMP Dimming is disabled during SS DSR cap is used to limit LLC control slew rate during dimming ICOMP voltage is maintained during dimming

13 UCC25710: DIMMING WAVEFORMS DIM input controls LEDSW DIM input triggers soft turn-on and turn-off of LLC converter LLC on-time is extended On-time extension is proportional to 1-D, D is dimming duty-cycle Extended on-time allows ICOMP to maintain current regulation at low D

14 UCC25710: LOW DUTY-CYLE ILLUSTRATION 1. LLC reaches power level equal to pedestal LED current in region B. Power is under delivered in region A, but is compensated for in region C 2. Region B is zero, but sum of A+C still deliveries correct energy. 3. Energy delivered in region A + C is too low, loop is open and realized peak LED current will drop 4. On-time is extended. A + C energy/pulse is correct to maintain same peak LED current

15 UCC25710: FAULT MANAGEMENT Faults OV highest LED string voltage UV lowest LED string voltage CL(1V) input current signal over-current CL(2V) input current signal latch-off TSD Chip thermal shutdown Response OV, CL(1V) & TSD: The LLC converter and LEDSW are turned off. When the fault clears a RESET and SS are initiated. UV: The LLC converter and LEDSW are turned off. A RESET and SS are immediately initiated, repeatedly, until fault clears. CL(2V): The LLC and LEDSW are latched off until UVLO recycles. During RESET the LLC converter and LEDSW are OFF During SS the LLC converter and LEDSW are ON, i.e. no DIMMING

PMP4302: Multi-string LLC AC/DC Driver for general LED lighting Reference Design PMP4302: AC input Multi-string LLC converter for general LED lighting TI Parts UCC28810 (TM PFC) UCC25710

16 PMP4302: Multi-string LLC AC/DC Driver for general LED lighting Reference Design PMP4302: AC input Multi-string LLC converter for general LED lighting TI Parts UCC28810 (TM PFC) UCC25710 (Multi-string LLC) UCC28610 (Aux Flyback) Vin 90V~ 264V Output with 4 string Topology TM PFC+Multistring LLC converter Eff. Dimming 92% PWM dimming Features Lowest cost than AC/DC + DC/DC Highest efficiency to 92% PWM dimming compatible Integrate LED open/short protection and over current protection Applications General LED lighting and LED backlight TV UCC28810 UCC25710

17 PMP4302: Schematics for UCC25700 after PFC stage PWM dimming and total current sensing

18 PMP4302: LED current output tolerance 230V ac input PWM Dimming Io1 Io2 Io3 Io4 % LED output current Vs Input voltage w/ 100% dimming % 2% 5% 10% 20% 30% 40% Output Current (A) % 60% 70% 80% 90% Input Voltage(V) Current tolerance can achieve <+-3% with dimming range from 1% to 100% 99% %

19 PMP4302: Efficiency (TM PFC + Multi-string LLC + Aux power) Efficiency Efficiency Input Voltage(V) Input Voltage(V) Dimming version Non-Dimming version

20 PMP4302: waveforms CH1: LEDSW MOSFET Vgs 5V/Div 1% dimming 5% dimming CH2: LED Output Current 1A/Div CH3: DSR 2V/Div CH4: Primary Current 1A/Div 50% dimming 90% dimming

21 PMP4302: waveforms CH1: Primary MOSFET Vds 100V/Div 90Vac input CH2: LED Output Current 200mA/Div CH4: Primary Current 1A/Div 230Vac input

22 PMP4302: Thermal and Bode Plot

Reference design Features PMP6251: LED Backlighting for Edge-Lite/ Group Dimming Digital TV Application Support to universal 90~264Vac range LED 4 outputs @120mA, 63V, 5Vsb@1A, 5V@3A, 13V@3A Eff 83.

23 Reference design Features PMP6251: LED Backlighting for Edge-Lite/ Group Dimming Digital TV Application Support to universal 90~264Vac range LED 4 63V, 5Vsb@1A, 5V@3A, 13V@3A Eff 83.7%@110Vac, 85.2%@240Vac Secondary side 120Hz blanking control for dimming 8mm height and 6mmheight for LED magnetic component Board dimension 300mm(L) * 200mm(W) * 8mm(H) LED output common + and LED OVP and UVP Integrated the protection ckt to reduce the solution part count. Dedicated controller for edge-lit/ group dimming base on the LLC topology UCC25710 Utility (90~265VAC) TM PFC UCC28051 Multi-Transformer UCC Channels/ 63V/120mA Providing design package Schematic, Gerbo file, PCB file, Magnetic components LLC PWM UCC25600 GM PWM UCC28610 Audio 12.7V/3A AD Board 5V/3A System- MCU (+5VSB/2A)

24 PMP6251: PFC+ Multi-string LLC Efficiency 92.00% 90.00% Efficiency Data of PFC+LLC Power Stage from 1% - 100% Dimming Eff%(PFC+LLC) Rate of Dimming 88.00% 86.00% 84.00% 82.00% 80.00% 0% 20% 40% 60% 80% 100% Eff% of (PFC+LLC) Efficiency exclude standby Power Converter at full load condition ~ 90%

Reference Design TI LED Driver Reference Design Solution PMP5541:12Vac input MR-16 LED (SEPIC) Reference

lighting Driver PMP4288: AC Input 200W AC/DC Power supply for Street LED lighting PMP4302: AC Input 110W

TL103 TPS92210 UCC28061 UCC25600 UCC28810 UCC25710 Application MR16 Commercial Tube Lighting PAR lighting

90-264 V ac 90-264 V ac 90-264 V ac 90-264 V ac Output 11V 350mA 40V 450 ma 16V~25V 350 ma 54V 3.

25 Reference Design TI LED Driver Reference Design Solution PMP5541:12Vac input MR-16 LED (SEPIC) Reference Design PMP4301: AC input, T10/T8 LED Driver for Fluorescent Lamp PMP4304A: AC input, 7W TRIAC dimming LED lighting Driver PMP4288: AC Input 200W AC/DC Power supply for Street LED lighting PMP4302: AC Input 110W AC/DC Power supply for Street LED lighting with multistring LLC MR16: PMP5541 TI Parts TPS40211 UCC28810 TL103 TPS92210 UCC28061 UCC25600 UCC28810 UCC25710 Application MR16 Commercial Tube Lighting PAR lighting w/ TRIAC Street LED lighting for outdoor Street LED lighting P out 3W 19 W 7 W 200 W 110W V in 12Vac V ac V ac V ac V ac Output 11V 350mA 40V 450 ma 16V~25V 350 ma 54V 3.7A 54V 700mAx4 Commercial: PMP4301 Residential: PMP4304 Outdoor: PMP4288 Visit for more LED driver reference designs

26 PMP4301: T10/T8 AC/DC LED Driver for Fluorescent Lamp Reference Design TI Parts V in Po Vo Io Topology Dimming Eff. PF AC Input T8 AC/DC LED Lighting Driver for fluorescent lamp UCC ~ 264 Vac 20W 30V~42V 450mA Isolated singe Stage high PF Flyback with Transition Mode PWM dimming >87% >0.97 Features Specific transformer for T8 lighting form factor PWM dimming compatible Low BOM cost Efficiency >87% at 230Vac input Isolated single stage w/ PF>0.97 at 230Vac input Output over voltage protection: 45Vdc Output ripple current: <30% of output current Size: 245mmX18mmx11mm (ultra-slim) Applications T8 and T10 tube LED lighting Wall-wash LED lighting Commercial LED lighting with PWM dimming H: 11mm W:18mm L:245mm

27 PMP4301: Schematics of Single Stage PFC with UCC28810 Vcc High voltage start up EMI filter and bridge diode + Output short & Open loop protections VSNS VDD EAOUT GDRV VINS GND ISNS TZE + + PWM Dimming interface No PWM, full light Have PWM input, dimming with duty % Constant current control & Output OVP protection

75 Input with 110VAC Input Voltage 200V/div 0.

28 PMP4301: PFC & THD Input Voltage 200V/div PMP4301 PFC 1 Input Current 200mA/div PF PF Input with 110VAC Input Voltage 200V/div Vin PMP4301 THD 16 Input Current 200mA/div THD THD 8 Input with 230VAC Vin PF>0.92 w/ wide range input

29 Peak efficiency is 87.7% at 110Vac & 220Vac PMP4301: Performance Output voltage 20V/div efficiency PMP4301 Iout efficiency Output ripple current with110vac input Output voltage 20V/div Output current 50mA/div Input Voltage 200V/div mA (+-1%) output current tolerance Output current 50mA/div Iout 0.45 Iout Input Voltage 200V/div Vin Output ripple current with 220VAC input

30 PMP4304: 7W TRIAC dimming LED lighting Driver Reference Design TI Parts V in Po Vo Topology Eff. PF Io AC Input 7W AC/DC LED Lighting Driver /w TRIAC dimming TPS92210 TL Vac 7W 16V~25V 350mA (5~7 LEDs) Singe Stage high PF with TRIAC dimming ~80% >0.95 Features 50 components counts with low BOM cost TRIAC dimmable solutions without flicking Primary side controls without opto-coupler Constant On-time control with high power factor Applications PAR20/30/38 LED Lighting Small form factor indoor Lighting

31 PMP4304 Schematics with TPS92210 Hold up dummy load Differential EMI filter Cascade Flyback Damp resistors Peak voltage feed forward 1. Vin On Time 2. Vin On Time Input voltage sensing for Initial power limitation with TRIAC angle If small angle, On Time will reduce to limit power and light brightness

32 DALI Demo and Evaluation Platform DALI controller TPS62260 EVM with MSP2131 DALI PHY for MSP430 32

33 TI LED Lighting Solutions Applications Light Bulb Replacement Automotive Lighting Street Lighting Back Lighting Area Lighting Off-Grid Signage High Performance Solution Expertise Analog Control Digital Control Wireless DC/DC AC/DC Linear LED Lab Full System Solutions Multi-String Single-String Multi-Stage Single-Stage TRIAC dimming Digital Power Communication Lighting Know-How Resources EVMs Cook Book Ref. Designs Sample Software Application Reports Local Design Services System Block Diagrams

34 Reference Designs, Products, White Papers, Articles, Tools, Videos, etc.

35 LED Reference Design Cookbook 35

36 Thank you

Industrial and Outdoor (>15W)

Industrial and Outdoor (>15W) AC/DC - PFC+ Flyback or or HB - Multi-String/Single-String - Multi-Transformer for HV LEDs DC/DC - Products and Features 1 Industrial and Outdoor/Infrastructure Lighting LED